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Date: 2011-01-06 03:07:04Engineering vehicles Dredgers Dredging Turbidity Gold mining Fortymile River Water quality Mining Placer deposit Water Water pollution Economic geology | uses science for a changing world Regional Baseline Geochemistry andAdd to Reading ListSource URL: pubs.usgs.govDownload Document from Source WebsiteFile Size: 1,07 MBShare Document on Facebook |